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January 19, 1920 - First meetings of the League of Nations in London

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January 19, 1920 - First meetings of the League of Nations in London

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The precursor to the UN, the League of Nations was founded to attempt to keep another World War from occurring.

Significance - This was one of the first world wide councils established to maintain peace. While ultimately the League of Nations failed, it showed future councils what not to do in order to function successfully.

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January 18, 1919 - Treaty of Versailles Conference opens

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January 18, 1919 - Treaty of Versailles Conference opens

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Explanation - 230 pages of peace negotiations with nothing in common with Wilson's 14 Points. It officially ends the war.

Significance - Germany was forced to assume most of the blame for the war. It saddles them with great debts under the harsh conditions of the treaty. Created years of resentment that eventually fuel the start of WWII.

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The fighting ended at 11 AM.

Significance - Germany had no more resources to fight with, and had spent a great deal of money on the war. This was the official ceasefire for WWI (not official end of war).

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January 8, 1918 - Wilson outline the 14 Points

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January 8, 1918 - Wilson outline the 14 Points

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Explanation - The 14 Points was an elaborate peace plan presented to the US Congress.

Significance - These 14 Points were eventually adopted as the basis for post-war peace negotiations (widely liked by the German populace).

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December 23, 1917 - Russia withdraws from WWI

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December 23, 1917 - Russia withdraws from WWI

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Russia was too broken after the Russian Revolution, and could not spare the resources to continue with the war.

Significance - Germany was forced to remove any troops they had in Russia and lost precious ground for their military actions.

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November 7, 1917 - October Revolution occurs in Russia

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November 7, 1917 - October Revolution occurs in Russia

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Bolsheviks under Lenin (communists) gain control of Russia.

Significance - Officially established Russia as a communist nation and would forever impact the future of Eastern Europe during the 20th century.

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June 25, 1917 - US troops land in France

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June 25, 1917 - US troops land in France

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After landing in the port of Saint Nazaire, American troops began training for battle along the Western Front.

Significance - The previous years of the war were long and bloody stalemates; when the Americans joined the war, the tides of war turned in favor of the Allies.

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A newspaper announcing the United States' intention to join the war after Germany sank one too many American merchant ships.

Significance - Ended the US's policy of neutrality during the war.

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March 15, 1917 - First Russian Revolution

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March 15, 1917 - First Russian Revolution

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Tsar Nicholas II abdicates.

Significance - The revolution saw the first rise of socialism in a major European country.

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A German u-boat washes up in Hastings, Great Britain, 1919

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A German u-boat washes up in Hastings, Great Britain, 1919

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February 1, 1917 - Germany resumes unrestricted submarine warfare

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February 1, 1917 - Germany resumes unrestricted submarine warfare

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Explanation - Remember when the Germans said they wouldn't attack ships in the Atlantic anymore? Yeah, they decided they didn't want to keep that promise anymore.

Significance - Technically, they did keep their attacks relatively isolated - just around the British Isles with the intent to prevent supplies from coming in and starve the people of Britain into submission.

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German Secretary of Foreign Affairs who confirmed the existence of the note.

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Explanation - A letter from Germany sent to Mexico was intercepted by British code breakers and sent to America. The note was encouraging Mexico to attack the United States immediately.

Significance - Had the note made it to Mexico, the US would have been brought into the war and potentially lost a portion of the nation obtained from Mexico in previous wars.

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September 18, 1915 - Germany calls off unrestricted submarine warfare

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September 18, 1915 - Germany calls off unrestricted submarine warfare

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Explanation - The Germans announced that they would no longer use their U-boats to target ships in the Atlantic.

Significance - While American trading vessels would now be safe to travel in the Atlantic, Germany did not call off the fighting in the Mediterranean Sea against Italian ships.

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Pulling into a port, possibly in New York.

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Explanation - The British passenger ship was sunk by German submarines (u-boats) as an act of aggression.

Significance - 1,959 people were aboard the ship. 1,198 of those people died when the ship sank, including 128 Americans.

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German soldiers wait at the first battle of WWI, the Battle of the Marne.

Significance - At the time, this was the beginning of the first war that included most major world powers.

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June 28, 1914 - Assassination in Sarajevo

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June 28, 1914 - Assassination in Sarajevo

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Explanation - Archduke Franz Ferdinand is assassinated by the Serbian terrorist organization "The Black Hand" because the Serbians wanted to become a part of the new Serbian nation.

Significance - Austria - Hungary (nation of the Archduke) threatened to declare war on Serbia, who was close allies with Russia (who in turn got angry), who was allies with Britain, France, Italy, and the US, and consequently this angered the rest of them.